在選用(yong)電(dian)線(xian)電(dian)纜時(shi)，一(yi)般要注意電(dian)線(xian)電(dian)纜型號、規格 (導體(ti)截面)的選擇。

　　01選用(yong)(yong)電(dian)(dian)(dian)(dian)(dian)線電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)時(shi)，要考慮(lv)用(yong)(yong)途，敷設條(tiao)件及安(an)全(quan)性;例如，根據用(yong)(yong)途的(de)不(bu)同(tong)，可(ke)選用(yong)(yong)電(dian)(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)、架空絕(jue)緣(yuan)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)、控制電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)等; 根據敷設條(tiao)件的(de)不(bu)同(tong)，可(ke)選用(yong)(yong)一(yi)般塑料絕(jue)緣(yuan)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)、鋼帶(dai)鎧(kai)裝電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)、鋼絲鎧(kai)裝電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)、防腐(fu)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)等; 根據安(an)全(quan)性要求，可(ke)選用(yong)(yong)不(bu)延燃(ran)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)、阻燃(ran)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)、無鹵阻燃(ran)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)、耐火電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)等。

　　02確定電(dian)線電(dian)纜使用(yong)規格 (導(dao)體截(jie)面)時，一般應考慮發熱，電(dian)壓損失(shi)，經(jing)濟電(dian)流密度(du)，機械強度(du)等選(xuan)擇(ze)條件。

　　根據經(jing)(jing)驗(yan)，低壓(ya)(ya)動(dong)力線(xian)因其(qi)(qi)(qi)負荷(he)電(dian)(dian)流較(jiao)大(da)，故一般(ban)先(xian)按(an)(an)(an)發(fa)熱(re)(re)條件選(xuan)擇截(jie)(jie)面，然后驗(yan)算其(qi)(qi)(qi)電(dian)(dian)壓(ya)(ya)損失和機械強度(du)(du);低壓(ya)(ya)照明線(xian)因其(qi)(qi)(qi)對電(dian)(dian)壓(ya)(ya)水(shui)平(ping)要求較(jiao)高(gao)，可(ke)先(xian)按(an)(an)(an)允(yun)許電(dian)(dian)壓(ya)(ya)損失條件選(xuan)擇截(jie)(jie)面，再驗(yan)算發(fa)熱(re)(re)條件和機械強度(du)(du);對高(gao)壓(ya)(ya)線(xian)路(lu)，則先(xian)按(an)(an)(an)經(jing)(jing)濟電(dian)(dian)流密度(du)(du)選(xuan)擇截(jie)(jie)面，然后驗(yan)算其(qi)(qi)(qi)發(fa)熱(re)(re)條件和允(yun)許電(dian)(dian)壓(ya)(ya)損失;而(er)高(gao)壓(ya)(ya)架(jia)空線(xian)路(lu)，還應驗(yan)算其(qi)(qi)(qi)機械強度(du)(du)。若用戶沒有經(jing)(jing)驗(yan)，則應征詢有關專業(ye)單位或(huo)人士的(de)意(yi)見。

　　說明：

　　同一規(gui)格(ge)鋁(lv)(lv)芯(xin)(xin)導(dao)線(xian)載流量約為銅芯(xin)(xin)的(de)0.7倍，選用鋁(lv)(lv)芯(xin)(xin)導(dao)線(xian)可(ke)比(bi)銅芯(xin)(xin)導(dao)線(xian)大(da)一個規(gui)格(ge)，交(jiao)聯聚乙烯絕緣可(ke)選用小(xiao)一檔規(gui)格(ge)，耐火電(dian)線(xian)電(dian)纜則應選較大(da)規(gui)格(ge)。

　　本表計算容量是(shi)以(yi)三相(xiang)380V、Cosφ=0.85為基準，若單相(xiang)220V、Cosφ=0.85，容量則應×1/3。

　　當(dang)環境溫度較(jiao)高或(huo)采用明敷方(fang)式(shi)等，其(qi)安全載流量都會下降，此(ci)時應選用較(jiao)大(da)規格(ge);當(dang)用于頻繁起(qi)動電機時，應選用大(da)2～3個規格(ge)。

　　本表聚氯(lv)乙烯(xi)絕(jue)緣(yuan)電線(xian)按單根(gen)(gen)架(jia)空敷(fu)設方式計算，若為穿管或多根(gen)(gen)敷(fu)設，則應選用大2～3個規(gui)格。

　　以上數據僅供(gong)參考，*終設計和確定電(dian)纜的型號和規格(ge)應參照有關(guan)專業資料(liao)或(huo)電(dian)工(gong)手冊。